Add drop down reference filter widget

[Andries-Smit]

• Add a new drop down reference selector filter, enables users to search over an association
  Implements feature request #8 and #13

[diego-antonelli]

Hi @Andries-Smit we appreciate this PR! Although for now the whole team is mobilized with features for Mx9, we will keep a task in our backlog and as soon as we can (probably FY2021/Q1) we will review and prioritize.

[WT-2988]

Thanks

[codecov-io]

Codecov Report

Merging #79 (aa207b7) into master (c3d41b5) will decrease coverage by 7.62%.
The diff coverage is 69.76%.

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
- Coverage   94.25%   86.63%   -7.63%     
==========================================
  Files          12       13       +1     
  Lines         331      389      +58     
  Branches       71       84      +13     
==========================================
+ Hits          312      337      +25     
- Misses         19       52      +33     

Impacted Files	Coverage Δ
src/DropDownSort/components/DropDownSort.ts	87.50% <ø> (ø)
src/Pagination/components/PageSizeSelect.ts	78.37% <ø> (ø)
src/Pagination/utils/ContainerUtils.ts	29.78% <27.77%> (ø)
src/Pagination/components/BreakView.ts	100.00% <100.00%> (ø)
src/Pagination/components/PageButton.ts	100.00% <100.00%> (ø)
src/Pagination/components/PageNumberButton.ts	100.00% <100.00%> (ø)
src/Pagination/components/PageNumberView.ts	100.00% <100.00%> (ø)
src/Pagination/components/Pagination.ts	100.00% <100.00%> (ø)

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